Multiple choice

If we keep moistened iron nails for a few days, the iron nails get covered with a reddish-brown substance, that is different from iron. Which of the following is/are not the changes that take(s) place?

a. The state as well as the composition of iron changed. b. The changes that took place were reversible. c. A new substance was formed.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct option as the change that took place was not reversible. It is irreversible.

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